kernel: replace bridge port isolate hack with upstream patch backport on 4.14

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(backported from 21ee8ce9b52f8ae4a6babf4032f71e2d4d56392b)
(rebased patches)
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 145 insertions, 0 deletions

diff --git a/target/linux/generic/backport-4.14/090-net-bridge-add-support-for-port-isolation.patch b/target/linux/generic/backport-4.14/090-net-bridge-add-support-for-port-isolation.patch
new file mode 100644
index 0000000000..6237177a45
--- /dev/null
+++ b/target/linux/generic/backport-4.14/090-net-bridge-add-support-for-port-isolation.patch
@@ -0,0 +1,145 @@
+From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
+Date: Thu, 24 May 2018 11:56:48 +0300
+Subject: [PATCH] net: bridge: add support for port isolation
+
+This patch adds support for a new port flag - BR_ISOLATED. If it is set
+then isolated ports cannot communicate between each other, but they can
+still communicate with non-isolated ports. The same can be achieved via
+ACLs but they can't scale with large number of ports and also the
+complexity of the rules grows. This feature can be used to achieve
+isolated vlan functionality (similar to pvlan) as well, though currently
+it will be port-wide (for all vlans on the port). The new test in
+should_deliver uses data that is already cache hot and the new boolean
+is used to avoid an additional source port test in should_deliver.
+
+Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
+Reviewed-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+
+--- a/include/uapi/linux/if_link.h
++++ b/include/uapi/linux/if_link.h
+@@ -326,6 +326,8 @@ enum {
+ 	IFLA_BRPORT_MCAST_TO_UCAST,
+ 	IFLA_BRPORT_VLAN_TUNNEL,
+ 	IFLA_BRPORT_BCAST_FLOOD,
++	IFLA_BRPORT_NEIGH_SUPPRESS,
++	IFLA_BRPORT_ISOLATED,
+ 	__IFLA_BRPORT_MAX
+ };
+ #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
+--- a/net/bridge/br_forward.c
++++ b/net/bridge/br_forward.c
+@@ -30,7 +30,8 @@ static inline int should_deliver(const s
+ 	vg = nbp_vlan_group_rcu(p);
+ 	return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
+ 		br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING &&
+-		nbp_switchdev_allowed_egress(p, skb);
++		nbp_switchdev_allowed_egress(p, skb) &&
++		!br_skb_isolated(p, skb);
+ }
+ 
+ int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
+--- a/net/bridge/br_input.c
++++ b/net/bridge/br_input.c
+@@ -170,6 +170,7 @@ int br_handle_frame_finish(struct net *n
+ 		goto drop;
+ 
+ 	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
++	BR_INPUT_SKB_CB(skb)->src_port_isolated = !!(p->flags & BR_ISOLATED);
+ 
+ 	if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
+ 		br_do_proxy_arp(skb, br, vid, p);
+--- a/net/bridge/br_netlink.c
++++ b/net/bridge/br_netlink.c
+@@ -138,6 +138,7 @@ static inline size_t br_port_info_size(v
+ 		+ nla_total_size(1)	/* IFLA_BRPORT_PROXYARP */
+ 		+ nla_total_size(1)	/* IFLA_BRPORT_PROXYARP_WIFI */
+ 		+ nla_total_size(1)	/* IFLA_BRPORT_VLAN_TUNNEL */
++		+ nla_total_size(1)	/* IFLA_BRPORT_ISOLATED */
+ 		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_ROOT_ID */
+ 		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_BRIDGE_ID */
+ 		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_DESIGNATED_PORT */
+@@ -208,7 +209,8 @@ static int br_port_fill_attrs(struct sk_
+ 		       p->topology_change_ack) ||
+ 	    nla_put_u8(skb, IFLA_BRPORT_CONFIG_PENDING, p->config_pending) ||
+ 	    nla_put_u8(skb, IFLA_BRPORT_VLAN_TUNNEL, !!(p->flags &
+-							BR_VLAN_TUNNEL)))
++							BR_VLAN_TUNNEL)) ||
++	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
+ 		return -EMSGSIZE;
+ 
+ 	timerval = br_timer_value(&p->message_age_timer);
+@@ -637,6 +639,7 @@ static const struct nla_policy br_port_p
+ 	[IFLA_BRPORT_MCAST_TO_UCAST] = { .type = NLA_U8 },
+ 	[IFLA_BRPORT_MCAST_FLOOD] = { .type = NLA_U8 },
+ 	[IFLA_BRPORT_BCAST_FLOOD] = { .type = NLA_U8 },
++	[IFLA_BRPORT_ISOLATED]	= { .type = NLA_U8 },
+ };
+ 
+ /* Change the state of the port and notify spanning tree */
+@@ -773,6 +776,11 @@ static int br_setport(struct net_bridge_
+ 			return err;
+ 	}
+ #endif
++
++	err = br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
++	if (err)
++		return err;
++
+ 	br_port_flags_change(p, old_flags ^ p->flags);
+ 	return 0;
+ }
+--- a/net/bridge/br_private.h
++++ b/net/bridge/br_private.h
+@@ -407,6 +407,7 @@ struct br_input_skb_cb {
+ #endif
+ 
+ 	bool proxyarp_replied;
++	bool src_port_isolated;
+ 
+ #ifdef CONFIG_BRIDGE_VLAN_FILTERING
+ 	bool vlan_filtered;
+@@ -554,6 +555,14 @@ int br_forward_finish(struct net *net, s
+ void br_flood(struct net_bridge *br, struct sk_buff *skb,
+ 	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
+ 
++/* return true if both source port and dest port are isolated */
++static inline bool br_skb_isolated(const struct net_bridge_port *to,
++				   const struct sk_buff *skb)
++{
++	return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
++	       (to->flags & BR_ISOLATED);
++}
++
+ /* br_if.c */
+ void br_port_carrier_check(struct net_bridge_port *p);
+ int br_add_bridge(struct net *net, const char *name);
+--- a/net/bridge/br_sysfs_if.c
++++ b/net/bridge/br_sysfs_if.c
+@@ -174,6 +174,7 @@ BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
+ BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
+ BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
+ BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
++BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
+ 
+ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
+@@ -223,6 +224,7 @@ static const struct brport_attribute *br
+ 	&brport_attr_proxyarp_wifi,
+ 	&brport_attr_multicast_flood,
+ 	&brport_attr_broadcast_flood,
++	&brport_attr_isolated,
+ 	NULL
+ };
+ 
+--- a/include/linux/if_bridge.h
++++ b/include/linux/if_bridge.h
+@@ -49,6 +49,7 @@ struct br_ip_list {
+ #define BR_MULTICAST_TO_UNICAST	BIT(12)
+ #define BR_VLAN_TUNNEL		BIT(13)
+ #define BR_BCAST_FLOOD		BIT(14)
++#define BR_ISOLATED		BIT(16)
+ 
+ #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
+